Prepare a medium-high fire on a gas or charcoal grill. In a medium bowl, toss the pork chops with 1 Tbs. of the oil, half of the thyme, 1 tsp. salt, and 1/2 tsp. pepper. Put the onions on a large plate and sprinkle with 2 Tbs. of the oil and 1-1/2 tsp. salt. In a small bowl, whisk the vinegar, su...